. >> reporter: dana, we have a light rain here on ocean beach. the wind is whipping but for ocean beach standards this is a moderate breeze. they have just finished today the clean-up from last week's sewage spill. and city officials say they have been checking drains and manholes to be sure they don't have to come back out here again. it will be a busy weekend for you. >> absolutely. this is when we go into overdrive. >> reporter: the spokesman for the san francisco public utilities commission says city crews will be hard at work this weekend making sure the water and sewage systems can hand the expected rain. just last week a downpour forced sewage on to ocean beach. could it happen again. we hope not. we have done everything we could. we have cleared the system to have all the capacity to deal with the water this weekend. >> reporter: that unexpected leak of untreated water has happened before. six years ago. separately there are occasional discharges in the ocean not accidents. they are part of what the city calls its combined system. a syste